diff --git a/earley.opam b/earley.opam
index 9d9a284..683d527 100644
--- a/earley.opam
+++ b/earley.opam
@@ -20,7 +20,7 @@ doc: "https://rlepigre.github.io/ocaml-earley/"
 
 depends: [
   "ocaml" { >= "4.03.0" & <= "4.07.1" }
-  "dune"  { build & >= 1.2.0 }
+  "dune"  { build & >= "1.2.0" }
 ]
 
 build: [ [ "dune" "build" "-p" name "-j" jobs ] ]